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firearm STATES PATENT RUDOLPH MULLER, OF CI-IRISTIANIA, NORIVAY.

FURNACE.

sPEqIFIGATIoN forming part of Letters Patent No. 538,737, dated m 7,1895. Application filed January 14, 1895. Serial No. 534,890- (No modeLlTo all whom, it may concern.-

Be it known that I, RUDOLPH MiiLLER, a subject of the King of Sweden andNorway, residing at Ohristiania, Norway, have invented new and usefulImprovements in Furnaces, of which the following is a specifica tion.

This invention relates tofurnaces, and it has for its object structuralfeatures whereby the efficiency of the furnace is materially enhancedand a substantially perfect or smokeless combustion of fuel attainedwith a corresponding economy of the latter, as Will now be fullydescribed.

In the accompanying drawings I have illustrated my invention in itsapplication to steam boilers, but I desire it understood that my saidinvention is applicable to furnaces adapted for use for other purposes,and in said drawings- Figure 1 is a half front elevation and halfvertical cross-section, and Fig. 2 a longitudinal vertical section onthe line 2 20f Fig. 1, of a water-tube steam-boiler provided with myimproved furnace, a portion of the mechanical stoker being broken awayin said Fig. 2.

The steam boiler illustrated in the drawings above described is of awell-known type, and will therefore not require a detailed descrip tion.

The furnace grate, or more properly the grates G for the furnace may beof any ordinary or preferred construction, the grate area being dividedinto sections by means of air lines I, preferably of a conical form incross section and having a concave bottom I. adapted to hold a body ofwater, said flues having their inlet below the grate sections and theiroutlet above the same, the outlet ports '5 in the apex of the cone beingdivergent so as to direct the air flowing through the flues in oppositedirections into the combustion chamber C. The flues, I, extend thefulllength of the grate sections G and their side walls are constructedin' sections longitudinally, the lower sections M being hinged to theupper sections and performing the functions of dampers, suitable means,not shown, being provided to adjust said dampers. Water from anysuitable source is supplied to the flues I, as may be required throughpipe 19 and suitable branch pipes 13 so that air or air and va por canbe supplied to the combustion chamber 0 through the medium ofsaid fluesand the volume of such air regulated by means of the dampers M.

Within the combustion chamber 0 I arrange a series of open bottomed fuelchambers 0, one above each grate section G, the vertical walls W of thechambers being hollow. These fuel chambers extend the full length of thegrate sections. They are arched over so as to form a flue to below andalong the arch, that is normally open to the atmosphere at one end andserves the two fold purpose of air and charging flue. The fuel chambersproper c are closed at opposite ends, the front end he ing closed by adoor d so as to obtain ready access to said chambers for any purpose. Inthe roof of the air flue w I provide a guide groove w that is T-shapedin section for the reception of correspondingly shaped hangers s (ofwhich Ihave shown one in Fig. l) in which the mechanical stoker S isjournaled, said stoker consisting of a semi-cylindrical trough adaptedto slide in and out of the flue w, and when filled with coal and pushedinto said space it can be emptied by giving it a half turn on itshangers or supports .9 as will be readily understood from an inspectionof the drawings. 4 The object of providing an air flue above thefuelchambers c is to afford a down draft through the fuel for the purpose ofentraining the gases evolved from the fuel into the combustion chamber0. The arrangement provides self-feeding hoppers, the fuel subsidinggradually as combustion proceeds,'and as said fuel is thoroughly heatedbefore reaching the zone of combustion, it will give up its volatileconstituents and become more or less "coked before it passes into saidzone of combustion, and if the supply of air or air and vapor throughthe grate and through the fines I is properly regulated, a substantiallyperfect or smokeless combustion is obtained. In fact, it will be evidentthat the described construction is equivalent to the subdivision of thefurnace into a number of self-feeding furnaces in which the adjacentcombustion chambers communicate with each other.

I have stated that the vertical walls W of the fuel chambers or hoppersc are preferably 'IOO made hollow, the object being to utilize the sameas water legs, the chambers thus formed being connected at theiropposite ends with the water space of the boiler B by means of pipes Pand P respectively, and suitable branch pipes 13 On a line with thegrate sections G in the front wall of the furnace I provide suitabledoors I), so that ready access can be had to the grates, and through thedoors at to the fuel chambers or hoppers c, the ash pit being alsoprovided with doors D, as usual. I further provide a sediment chamber orcollector in the form of a pipe P to which is connected the boiler pipeP and the branch pipes 19 connected to the rear end of chambered hopperwall W, see Fig. 1, a perfect circulation being thus established betweenthe boiler and the chambers in said walls.

The described construction of furnace may of course be modified in itsdetails, and will necessarily require modification to adapt the same tothe special uses made of it, or as the service may require, and I do notdesire to limit myself to the exact construction shown and described.

Having thus described my invention and in what manner the same is to beperformed, I declare that what I claim is 1. In a furnace, thecombination with the combustion chamber and its grate, and air finesdividing the said grate into sections and having their inlets andoutlets respectively above and below the grate sections, of a fuelmagazine for each grate section, said fuel magazines arranged within thecombustion chamber to form circulating fines between each other and thechamber walls, whereby the heat and products of combustion aredistributed and caused to circulate around the magazines before leavingthe combustion chamber, for the purpose set forth.

2. In a furnace, the combination with the combustion chamber, its grate,and air fines dividing said grate into sections and having their inletsand outlets respectively below and above the grate sections, of a fuelmagazine for each grate section having hollow vertical walls, saidmagazines arranged within the combustion chamber to form circulatingfines between each other and the chamber walls, and means forcirculating water through the magazine walls, for the purpose set forth.

3. In a furnace, the combination with the combustion chamber, its grate,and air flues dividing said grate into sections and having their inletsand outlets respectively below and above the grate sections, of a fuelmagazine for each grate section arranged within the combustion chamberto form circulating fines parallel with the aforesaid air fines, for thepurpose set forth.

4. In a furnace, the combination with the grate, of air flues adapted tocontain water dividing said grate into sections and having their inletsand outlets respectively below and above the grate sections, and meansfor controlling the flow of air through said lines, for the purpose setforth.

5. In a furnace, the combination with the grate, air fines adapted tocontain water dividing said grate into sections and having their inletsand outlets respectively below and above said grate sections, of a fuelmagazine for each grate section,said magazines of less diameter thantheir respective grate sections, substantially as and for the purposeset forth.

6. In a furnace, the combination with the grate, of air flues ofconoidal form in cross section provided with a concave bottom adapted tohold water, said fines extending the full length of and dividing saidgrate into sections, and having their inlets and outlets respectivel yabove and below said grate sections, and means for controlling the flowof air through said fines, for the purpose set forth.

7. In a water-tube boiler, the combination with the water tubes, acombustion chamber below the same, its grate, and air flues dividingsaid grate into sections and having their inlets and outletsrespectively above and belowthe grate sections, of a fuel magazine foreach grate section arranged within the combustion chamber to formcirculating and distributing fines between each other and the chamberwalls, substantially as and for the purpose set forth.

8. In a water tube boiler, the combination with the boiler, the watertubes, a combustion chamber below the same, a grate in said chamber, airflues dividing the grate into sections and having their inlets anddiverging outlets respectively below and above the grate sections, of afuel magazine for each grate section provided with hollow walls, saidmagazines arranged within the combustion chamber to form circulating anddistributing flues between each other and the chamber walls, and pipeconnections connecting the magazine walls with the water space of theboiler, substantially as and for the purpose set forth.

9. In a furnace, the combination with the grate, air fines dividing thegrate into sections and having their inlet and outlets respectivelybelow and above the grate, means for supplying water to the dues andmeans for controlling the flow of air therethrough, of a fuel magazinefor each grate section constructed with hollow walls, said magazines ofless diameter than their respective grate sections, a water supply pipe,and branch pipes connecting the supply pipe with the magazine walls,substantially and for the purpose set forth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

RUDOLPH MI TLLER.

Witnesses:

ALFRED J. BRYR, JOB VAALER.

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